silence compiler warnings for RHEL 9 Linux

We updated ${CSILENCE} Makefile variables for entries in an attempt to
minimize compiler warnings.  This was tested using
gcc version 11.4.1 20230605 (Red Hat 11.4.1-2) (GCC).

TODO: Recheck macOS clang to see if any new warnings have occur
      under macOS clang.

2004/sds/Makefile

@@ -38,8 +38,8 @@ include ../../var.mk
 
 # Common C compiler warnings to silence
 #
-CSILENCE= -Wno-unsequenced -Wno-unused-value -Wno-strict-prototypes -Wno-unused-parameter \
-	  -Wno-implicit-int
+CSILENCE= -Wno-unsequenced -Wno-unused-value -Wno-strict-prototypes \
+	  -Wno-unused-parameter -Wno-implicit-int -Wno-sequence-point
 
 # Common C compiler warning flags
 #
@@ -85,7 +85,7 @@ CC= cc
 ifeq "$(findstring $(CLANG),${CC})" "$(CLANG)"
 #
 CSILENCE+= -Wno-missing-prototypes -Wno-missing-variable-declarations \
-	-Wno-poison-system-directories
+	   -Wno-poison-system-directories
 #
 CWARN+= -Weverything
 #